Revenue Recognition - Schedule of Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,801	$ 2,472
Transaction-based expenses	511	576
Total revenues, less transaction-based expenses	2,290	1,896
Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	235	232
Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	1,734	1,673
Transaction-based expenses	511	576
Total revenues, less transaction-based expenses	1,223	1,097
Exchanges Segment | Net Interest Income
Disaggregation of Revenue [Line Items]
Total revenues	24	24
Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	568	563
Transaction-based expenses	0	0
Total revenues, less transaction-based expenses	568	563
Fixed Income and Data Services Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Fixed Income and Data Services Segment | Net Interest Income
Disaggregation of Revenue [Line Items]
Total revenues	38	37
Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues	499	236
Transaction-based expenses	0	0
Total revenues, less transaction-based expenses	499	236
Mortgage Technology Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	959	825
Services transferred at a point in time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	742	635
Services transferred at a point in time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	111	123
Services transferred at a point in time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	106	67
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	1,331	1,071
Services transferred over time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	481	462
Services transferred over time | Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	235	232
Services transferred over time | Exchanges Segment | Services transferred over time related to risk management of open interest performance obligations
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	93	76
Services transferred over time | Exchanges Segment | Services transferred over time related to listings
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	122	126
Services transferred over time | Exchanges Segment | Services transferred over time related to regulatory fees, trading permits, and software licenses
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	31	28
Services transferred over time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	457	440
Services transferred over time | Fixed Income and Data Services Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	449	430
Services transferred over time | Fixed Income and Data Services Segment | Services transferred over time related to risk management of open interest performance obligations
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	8	10
Services transferred over time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	393	169
Services transferred over time | Mortgage Technology Segment | Recurring revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	390	165
Services transferred over time | Mortgage Technology Segment | Other
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	$ 3	$ 4